Stretching interventions aim to improve ROM motion by increasing the overall length and/or lengthening properties of the muscle. To successfully achieve these adaptations, the muscle must experience adequate tensile stimulus during the intervention. However, it has been shown by previous studies examining muscle behaviour during stretch, that the muscle and fascicles in children with CP lengthen less than in TD children. Our own studies have confirmed this observations at the muscle, but also shown that the tendon in children with CP lengthens more during a stretch, than in TD children. These observations indicate that the higher stiffness of the target muscle relative to the in series tendon prevents the muscle fibres to experience a sufficiently large stretching stimulus, and the adaptations are small. Accordingly, in a recent study on long term stretching interventions it has been shown that muscle and fascicle strain increase, but no changes in the muscle's resting length or functional improvements have been found.